Carburetor



Fieb. 27, 1934- o. e. .1. s. DE RoYsANcouR 1,943,700

CARBURETOR Filed June 27, 1930 2 Sheets-Sheet 1 maven/Z01:

V Zak HTTORNLyS 1934- o. G. J. 5. DE ROYSANCOUR 1,943,700

CARBURETOR 2 Sheets-Sheet 2 Filed June 27, 1930 Patented Feb. 27, 1934 PATENT OFFICE CARBURETOR Otto George Johan Struycken de Roysancour, Breda, Netherlands Application June 27, 1930, Serial No. 464,153 In Germany July 12, 1929 3 Claims. (CL 261-66) This invention relates to carburetors as employed with internal combustion engines using liquid fuels, such as gasoline alcohol, etc.

As is well known, in a carburetor having a single jet and an air intake of fixed shape, the quantities of air and fuel composing the combustible mixture fed to the motor, do not vary uniformly with varying speed of the motor, the quantity of air being a parabolic function of the depression (Bernouillis law) and the quantity of fuel a linear function of the said depression (Poisseuille law). I i

In fact the fuel flow is principally governed by the frictional resistance whereas the flow of air is influenced rather by the acceleration im parted thereto.

Fig. 1 of the annexed drawings shows diagrammatically the relations existing between the proportions of gasoline and 'air at the different speeds of the motor.

In this figure, the number of revolutions of the motor have been marked on the abscissa axis and the quantities of air and gasoline on the ordinate axis, the flow of gasoline being indicated by the line 0 A and the flow of air by the curve 0' B. It will be easily understood on considering this diagram that if the proportion of air and fuel is right, at a certain given number of revolutions, that is to say for a certain depression, it will be wrong at anyother.

To remedy this inconvenience with all its well known trouble several constructions have already been proposed, each however seriously complieating the construction of the carburetor by the use of secondary nozzles, automatic supplementary air ports or other expedients.

According to my invention however a constant mixture, that is to say, one in which the variations of the quantities of air and fuel are represented by identical curves, may be obtained at all speeds of the motor, at the same time eliminating the lag eifect of the normal type of carburetor when accelerating or decreasing speed, in

a very simple and reliable way without any com- 4'5'1 plication at all. g

With this object in view, my invention essentially consists in the special arrangements and combinations of parts hereinafter fully described and pointed out in the appended claims.

Referring again to the annexed drawings:

Fig. 2 is a cross sectional view and Figure 3 a plan and cross sectional view of a carburetor constructed according to my invention, the

section being taken on line 3-3 in Fig. 2.

Figures 4 and 5 are'views similar to Figures 2 and 3, showing another embodiment of the invention.

Figures 6 and 7 show a detail.

In the embodiment shown in Figure 2 the carburetor comprises a body or casing 1 forming 601 two compartments or vessels 2 and 3 integral with an air intake such as a pipe 4 which extends at the upper part of the compartment 3. The

compartments or vessels 2 and 3 are separated by a partition 5 and communicate with each other through an opening 6. The compartment or vessel 2 is provided at its upper part with a tubular projection 7 to which is connected by means of a nut 9, a gasoline feeding pipe 8. In the vessel 2 is arranged a float 10 provided as usual with a needle valve 11 which is adapted to close the opening through which the gasoline is drawn As shown on the drawings, in the partition separating the air intake pipe 4 from the vessel 3 a circular concavity is formed, the diameter of which progressively decreases from the'lower towards the upper surface, so as to be finally reduced to a spraying orifice 12.

The lower part ofthe body 1 is closed by a bottom 13 which can be removed when the apparatus is to be cleaned or repaired.

This bottom is provided at its under surface with a tubular projection 14 through which passes a rod 15 provided at its lower end with a knob 16 which is applied against the lower face of the said projection. This rod 15 passes through the bottom 13 and engages by its threaded extremity a threaded opening 17 in the partition 5.

A space 18 is left free between the rod 15 and the bottom 13 and the walls of the projection 14. If the knob 16 is unscrewed the rod 15 and the knob are displaced downwards so that the gasoline will flow through the space 18 and then to the outside through a channel 19 formed in the knob, thus enabling the carbureter to be emptied when desired, the bottom 13 being retained in place by means of a spring 20 which bears at one end against the bottom 13 and at the other end against the knob 16.

Instead of forming communicating opening 12 between the vessel 3 and the air intake 4 in a fixed partition, a circular opening 21 may be formed in the wall between the vessel 3 and the air intake pipe 4, as shown in Figs. 4 and 5, into which opening a removable partition 21 may be threaded.

As shown in Figs. 6 and 7, the removable partition 21 is provided with a shoulder 23 which is adapted to be seated in a corresponding recess in the body 1 and is further provided with a thread 22 for engagement with the thread 21, so as to render possible the screwing of the partition 21 into the opening formed in the wall. This partition 21 is moreover provided with a central concavity 24 the diameter of which progressively decreases so as to form a spraying orifice 25 for the gasoline, as shown in Figs. 6 and 7.

The advantage of the construction shown in Figs. 4 to 7 is that when a fuel other than gasoline is to be used, the partition 21 may be removed and another partition having a passage or spraying orifice, of different diameter substituted therefor. In view of the interchangeability of the partition 21 it is consequently possible to adjust the diameter of the spraying orifice to the kind of fuel to be used.

As shown in Fig. 4, instead of connecting the gasoline feeding pipe 8 directly with the projection 7 of the vessel 2, this connection may be obtained through an intermediate coupling 26 which is threaded into the projection '7 and which is connected to the pipe 8 by means of a nut 27.

As will readily be understood, if the nut 27 is loosened and the coupling 26 displaced up or downwards the needle valve 11 and the float 10 will be correspondingly displaced, thus making it possible to modify and control the level of the gasoline in the vessels 2 and 3.

As shown in the drawings, and whatever may be the construction, the vessel 2 may form guides 28 for the needle valve 11.

When the carburetor is in operation, the sucking of the motor, which causes the flow of the air in air intake pipe 4, exerts simultaneously its action on the gasoline or other fuel contained in the vessel 3 in such a manner that the said fuel flows freely through the passage 12 or 25 and mixes with the air.

Under those conditions, there is no frictional resistance which the gasoline must overcome, and consequently the flow of gasoline and air will vary uniformly with the sucking action of the motor, a correct mixture being thus obtained as indeed the resistance offered to the flow of the fuel on its way from the compartment 3, wherein it is maintained at a constant level, to the air in- Moreover, it is to be noticed that as the carburetor, according to the present invention, comprises neither auxiliary nozzles, nor any other controlling devices and as it is formed of parts having no complicated forms it can be very easily cast and constructed.

Another advantage of a carburetor constructed according to the above mentioned feature is the absence of any appreciable lag as there is practically no fuel to be accelerated or decelerated, except the small quantity of fuel passing through the passage 12 or 25, which is of no importance.

Obviously my invention is not restricted to the specific constructions described, as indeed the necessary conditions to secure a constant mixture can be realized by taking the fuel directly from a container of sufficient capacity through any nozzle offering practically no resistance to the fuel passing therethrough to the air intake, the form of which nozzle can easily be conceived by any expert in the art, such for instance as those used in fluid metering devices.

What I claim is:

1. A carburetor for internal combustion engines, comprising a vessel, a partition in said vessel dividing the same into two compartments, one of said compartments containing liquid fuel and the other communicating with the atmosphere and adapted to be subjected to the suction action of a motor, said partition being provided with an orifice the wall of which is without substantial depth, thereby to oppose a minimum of resistance to the flow of fuel.

2. A carburetor for internal combustion engines, comprising in combination, a vessel containing liquid fuel, an air intake pipe communicating with the atmosphere and adapted to be subjected to the suction action of a motor, said pipe extending along one of the walls of said vessel and communicating with the vessel through an orifice the wall of which is without substantial depth, thereby to oppose practically no resistance to the flow of fuel from said vessel.

3. A carburetor for internal combustion engines, comprising in combination, a vessel containing liquid fuel, an air intake pipe integral with said vessel, a partition separating said pipe from the vessel, said partition being provided with a communicating opening, the partition progressively decreasing in thickness toward said opening so that the wall around the opening is without substantial depth, whereby practically no resistance is opposed to the flow of fuel through said opening.

OTTO GEORGE JOHAN STRUYCKEN DE ROYSANCOUR. 

